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The elastic constants of cuprous oxide have been measured by a standard pulse echo technique. The low temperature limiting values of the stiffness moduli are (in units of 1011 dyn/cm2) C11 = 12.1 ± 0.5, C12 = 10.5 ± 0.4, C44 = 1.09 ± 0.03. The Debye temperature calculated from these is 181° K. Both shear moduli show an unusual increase with increasing temperature.
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Hallberg et al. (1970) studied this question.
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